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Trust your test results??

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Discuss Trust your test results?? in the UK Electrical Forum area at ElectriciansForums.net

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Last week I investigated a 3036 fuse blowing on a radial - different IR on each end, no continuity on the CPC. So I left the circuit isolated. I pondered as to whether the ultra low IR was related to a new water main being installed about 3 months earlier!
So I went in again today and found that the cable was loose at both ends so pulled a new cable through and found:
Photo will be added if this stupid forum will let me!!
 
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Is there something about posting pics here I don't know?
 
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Here is your picture (I hope lol) Murdoch.
 

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I don't normally get pictures and post from other fora without permission, I only took the liberty this time as it seems you were having some technical difficulties.
I hope you don't mind.
 
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I believe the technical term is 'forked'. I always wanted to hack the firmware of an MFT to display 'WTF?' if it didn't believe the results itself, but time doesn't permit such frivolities round here. I did make a tester for a particular data system that displays 'Plug the sm*gging cable in' if it can't detect any signal.
 
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Murdoch said:
Last week I investigated a 3036 fuse blowing on a radial - different IR on each end, no continuity on the CPC.
Click to expand...
If the wires were blown apart inside the cable then the IR tests at each end would be testing 2 completely different fault paths so your MFT was probably telling the truth when it gave you 2 different results.
 
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If that cable was crushed by a water pipe I'm surprised it didn't put a pin------ hole in the pipe as well and cause a leak.

A few years ago we went to inspect an ammonia refrigeration plant in Mozambique that had dumped around 60 kilos of ammonia into a fish packing plant after a pipe that had been sitting on a cable finally wore through the insulation and the flash from the contact with the live wire had also blown a hole in the pipe. The result was 11 people hospitalized and over 4.5 tons of scrap fish. The plant had been cordoned off for 3 days until it was declared it safe and the stench of the rotting fish was so strong you could taste it even through a safety mask.
 
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Marvo said:
If that cable was crushed by a water pipe I'm surprised it didn't put a pin------ hole in the pipe as well and cause a leak.

A few years ago we went to inspect an ammonia refrigeration plant in Mozambique that had dumped around 60 kilos of ammonia into a fish packing plant after a pipe that had been sitting on a cable finally wore through the insulation and the flash from the contact with the live wire had also blown a hole in the pipe. The result was 11 people hospitalized and over 4.5 tons of scrap fish. The plant had been cordoned off for 3 days until it was declared it safe and the stench of the rotting fish was so strong you could taste it even through a safety mask.
Click to expand...
so it was up there with Grimsby then?...

- - - Updated - - -

Marvo said:
If the wires were blown apart inside the cable then the IR tests at each end would be testing 2 completely different fault paths so your MFT was probably telling the truth when it gave you 2 different results.
Click to expand...
common sense this...
 
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